| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 863-60** | (301) 863-6000 - (301) 863-6099 | 72 |
| (301) 863-61** | (301) 863-6100 - (301) 863-6199 | 73 |
| (301) 863-62** | (301) 863-6200 - (301) 863-6298 | 74 |
| (301) 863-63** | (301) 863-6301 - (301) 863-6398 | 70 |
| (301) 863-64** | (301) 863-6400 - (301) 863-6499 | 83 |
| (301) 863-65** | (301) 863-6502 - (301) 863-6597 | 74 |
| (301) 863-66** | (301) 863-6601 - (301) 863-6696 | 54 |
| (301) 863-67** | (301) 863-6700 - (301) 863-6798 | 73 |
| (301) 863-68** | (301) 863-6800 - (301) 863-6899 | 69 |
| (301) 863-69** | (301) 863-6902 - (301) 863-6999 | 72 |
US Phone Directory: (301) 863-6***
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